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3. print(“foobar”) 4. hi() Below the function you may see three lines where it is invoked. Lets have a look at one particular invocation: The invocation is just a function name followed by the arguments that are supposed to be passed as an argument list. The arguments are expected to be placed within brackets. In this case we have no argument list thus the brackets are empty. Functions with parameters Sometimes, you’ll want functions to alter their behaviour in different conditions. To do this, you can use function arguments.
1. def foo(bar, zoo=”blah”): 2. is valid. Meanwhile: 1. def foo(bar=”blah”, zoo): 2. is not. Return values Lets have a look at one of the code snippets that was covered previously in the exercises: 1. N = 10 2. distance_in_kilometers = 100 * N 3. distance_in_meters = distance_in_kilometers * 1000 What if you want to encapsulate this logic in a function in such a manner that you could pass time in hours and speed in km/h and somehow get back a distance traveled in meters? This logic could be implemented using the following function: 1.
ANSWER: 1. def function(x, y): 2. return x ** y + 100 Exercises PROBLEM: Which function definitions are valid? 1. 2. 3. 4. 5. @foo(bar): _foo(bar = 1): foo(bar = 2, bla = 1): foo(bar = 2, bla): foo($bar, bla = 1): ANSWER: 1. 2. 3. 4. 5. invalid: symbol @ in function’s name valid valid: there are several arguments with default values invalid: argument without default value invalid: symbol $ in argument’s name Exercises PROBLEM: Change the function below to return the greeting instead of printing it: 1.